The Texas Supreme Court recently granted a petition for review in ETC Marketing, Ltd v. Harris County Appraisal District, 467 S.W.3d 501 (Tex. App.—Houston [1st Dist.] 2015, pet. granted). The question before the high court in ETC Marketing, Ltd is whether an operator of an intrastate natural gas pipeline in Texas is required to pay ad valorem taxes on the value of 33 billion cubic feet of gas stored in a Harris County reservoir. The stakes are high as the 33 billion cubic feet of gas could give rise to a $162 million ad valorem tax bill.